1 /*
2 * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 /* Copyright (c) 1992-2009 Oracle and/or its affiliates, and Stanford University.
26 See the LICENSE file for license information. */
27
28 // Age table for adaptive feedback-mediated tenuring (scavenging)
29 //
30 // Note: all sizes are in oops
31
32 class ageTable VALUE_OBJ_CLASS_SPEC {
33 friend class VMStructs;
34
35 public:
36 // constants
37 enum { table_size = markOopDesc::max_age + 1 };
38
39 // instance variables
40 size_t sizes[table_size];
41
42 // constructor. "global" indicates that this is the global age table
43 // (as opposed to gc-thread-local)
44 ageTable(bool global = true);
47 void clear();
48
49 // add entry
50 void add(oop p, size_t oop_size) {
51 int age = p->age();
52 assert(age > 0 && age < table_size, "invalid age of object");
53 sizes[age] += oop_size;
54 }
55
56 // Merge another age table with the current one. Used
57 // for parallel young generation gc.
58 void merge(ageTable* subTable);
59 void merge_par(ageTable* subTable);
60
61 // calculate new tenuring threshold based on age information
62 int compute_tenuring_threshold(size_t survivor_capacity);
63
64 private:
65 PerfVariable* _perf_sizes[table_size];
66 };
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1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_AGETABLE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_AGETABLE_HPP
27
28 #include "oops/markOop.hpp"
29 #include "oops/oop.hpp"
30 #include "runtime/perfData.hpp"
31
32 /* Copyright (c) 1992-2009 Oracle and/or its affiliates, and Stanford University.
33 See the LICENSE file for license information. */
34
35 // Age table for adaptive feedback-mediated tenuring (scavenging)
36 //
37 // Note: all sizes are in oops
38
39 class ageTable VALUE_OBJ_CLASS_SPEC {
40 friend class VMStructs;
41
42 public:
43 // constants
44 enum { table_size = markOopDesc::max_age + 1 };
45
46 // instance variables
47 size_t sizes[table_size];
48
49 // constructor. "global" indicates that this is the global age table
50 // (as opposed to gc-thread-local)
51 ageTable(bool global = true);
54 void clear();
55
56 // add entry
57 void add(oop p, size_t oop_size) {
58 int age = p->age();
59 assert(age > 0 && age < table_size, "invalid age of object");
60 sizes[age] += oop_size;
61 }
62
63 // Merge another age table with the current one. Used
64 // for parallel young generation gc.
65 void merge(ageTable* subTable);
66 void merge_par(ageTable* subTable);
67
68 // calculate new tenuring threshold based on age information
69 int compute_tenuring_threshold(size_t survivor_capacity);
70
71 private:
72 PerfVariable* _perf_sizes[table_size];
73 };
74
75 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_AGETABLE_HPP
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